The official start of the 2011-12 TV season is upon us. DVRs will be getting a serious workout on pretty much every night of the week, and we're going to look at a few time periods where the battle for eyeballs might be particularly fierce.How curious are you about Ashton Kutcher's debut on "Two and a Half Men"? Will you remain curious after Monday's (Sept. 19) season premiere? Can "Dancing With the Stars" keep holding your interest? And what about "House" -- remember him?Those are the Monday-night questions we have going into the start of the season. It's a competitive night across the board, but we're focusing on the 9 p.m. ET hour, where things could get seriously rough between ABC, CBS and FOX, all of which have veteran shows that have historically performed quite well.The incumbent(s): "Dancing With the Stars" had a great 2010-11 season, scoring sizable gains in total viewers (22 million for...